The Rosary has Influnced World History in several ways. Listen & Watch This Video to get answers to several questions troubling You. The Rosary", says the Roman Breviary, "is a certain form of prayer wherein we say fifteen decades or tens of Hail Marys with an Our Father between each ten, while at each of these fifteen decades we recall successively in pious meditation one of the mysteries of our Redemption." The same lesson for the Feast of the Holy Rosary informs us that... Topics: The Rosary, World History, Virgin Mary.